I’d separate those two. Mueller definitely does not want to indict Hillary which would trigger civil war because it would leave to Obama as well. So he needs an “out”. He’s already got his scalps and could just say “that’s all folks” and fold up his tent leaving the rest for someone else to deal with.
Or he could nail one or both of the Podestas on collusion charges related to the Manafort deal but fall short of tying anything to U1 and bail.
Either way if you look at this thru his lens, the goal is to get out quickly now, not start a chain reaction.
You underestimate how dirty Mueller is. His goal has always been to damage Trump. He will not stop with Manafort, and he will never indict a Podesta.
Mueller definitely does not want to indict Hillary which would trigger civil war because it would leave to Obama as well.
Muller may use that as a pretext to avoid doing what he does not want to do, but it is just a pretext.